After James died shortly thereafter, his brother William Foster Cockshutt took over as president.

During World War II Cockshutt's Brantford, Ontario, factory, operating as Cockshutt Aircraft Division, manufactured undercarriages for several types of British bombers, including the Avro Lancaster Mk X being built by Victory Aircraft at Malton, and built plywood fuselages and wings for the Avro Anson training aircraft and for Britain's famous de Havilland Mosquito bomber.

Canada Post commemorated the 50th anniversary of the Model 30's launch with a postage stamp on June 8, 1996.

The high water mark of production of the Model 30 was reached in 1948 when 10,665 tractors were made and marketed across Canada.

The company especially wanted to enter the large farm tractor market south of the border in the United States.

The first agreement was signed with the National Farm Machinery Co-operative (NFMC) in the midwestern United States.

[5] Some of these locally owned farmer-owned co-operatives, especially those located in Michigan, Ohio, and Indiana, were affiliated with the American Farm Bureau.

By October 1946 the new orange Model E-3 tractors were rolling off the assembly line at the Brantford factory and were beginning to show up at local farmer-owned co-operatives all across the Midwest of the United States.

These tractors were wholesaled by the Farmers Union Grain Exchange located in St. Paul, Minnesota.

The big-brother Model 580[16] was never mass-produced; the first three hand-assembled units were on the shop floor in the plant when the shut down order came in early 1962.

In 1958, the company ownership was taken over by English Transcontinental, a British mercantile bank buying on behalf of an American investment group that became the forerunner of White.

White had previously acquired Oliver Corporation in late 1960 and subsequently bought Minneapolis-Moline in early 1963.